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drm/i915/guc: Cache the client mapping 

Use i915_gem_object_pin_map() for the guc client's lifetime to replace
the peristent kmap + frequent kmap_atomic with a permanent vmapping.
This avoids taking the obj->mm.lock mutex whilst inside irq context
later.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98571
Fixes: 96d7763452 ("drm/i915: Use a radixtree for random access...");
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20161102175051.29163-9-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Chris Wilson 2016-11-02 17:50:47 +00:00
parent a933568eb6
commit 72aa0d899a
2 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/gpu/drm/i915/i915_guc_submission.c
View File

@ -220,7 +220,7 @@ static int guc_update_doorbell_id(struct intel_guc *guc,
struct guc_context_desc desc;
size_t len;
doorbell = client->client_base + client->doorbell_offset;
doorbell = client->vaddr + client->doorbell_offset;
if (client->doorbell_id != GUC_INVALID_DOORBELL_ID &&
test_bit(client->doorbell_id, doorbell_bitmap)) {
@ -326,7 +326,7 @@ static void guc_proc_desc_init(struct intel_guc *guc,
{
struct guc_process_desc *desc;
desc = client->client_base + client->proc_desc_offset;
desc = client->vaddr + client->proc_desc_offset;
memset(desc, 0, sizeof(*desc));
@ -413,8 +413,8 @@ static void guc_ctx_desc_init(struct intel_guc *guc,
gfx_addr = i915_ggtt_offset(client->vma);
desc.db_trigger_phy = sg_dma_address(client->vma->pages->sgl) +
client->doorbell_offset;
desc.db_trigger_cpu = (uintptr_t)client->client_base +
client->doorbell_offset;
desc.db_trigger_cpu =
(uintptr_t)client->vaddr + client->doorbell_offset;
desc.db_trigger_uk = gfx_addr + client->doorbell_offset;
desc.process_desc = gfx_addr + client->proc_desc_offset;
desc.wq_addr = gfx_addr + client->wq_offset;
@ -465,7 +465,7 @@ int i915_guc_wq_reserve(struct drm_i915_gem_request *request)
{
const size_t wqi_size = sizeof(struct guc_wq_item);
struct i915_guc_client *gc = request->i915->guc.execbuf_client;
struct guc_process_desc *desc = gc->client_base + gc->proc_desc_offset;
struct guc_process_desc *desc = gc->vaddr + gc->proc_desc_offset;
u32 freespace;
int ret;
@ -506,10 +506,9 @@ static void guc_wq_item_append(struct i915_guc_client *gc,
struct intel_engine_cs *engine = rq->engine;
struct guc_process_desc *desc;
struct guc_wq_item *wqi;
void *base;
u32 freespace, tail, wq_off, wq_page;
u32 freespace, tail, wq_off;
desc = gc->client_base + gc->proc_desc_offset;
desc = gc->vaddr + gc->proc_desc_offset;
/* Free space is guaranteed, see i915_guc_wq_reserve() above */
freespace = CIRC_SPACE(gc->wq_tail, desc->head, gc->wq_size);
@ -539,10 +538,7 @@ static void guc_wq_item_append(struct i915_guc_client *gc,
gc->wq_rsvd -= wqi_size;
/* WQ starts from the page after doorbell / process_desc */
wq_page = (wq_off + GUC_DB_SIZE) >> PAGE_SHIFT;
wq_off &= PAGE_SIZE - 1;
base = kmap_atomic(i915_gem_object_get_page(gc->vma->obj, wq_page));
wqi = (struct guc_wq_item *)((char *)base + wq_off);
wqi = gc->vaddr + wq_off + GUC_DB_SIZE;
/* Now fill in the 4-word work queue item */
wqi->header = WQ_TYPE_INORDER |
@ -555,8 +551,6 @@ static void guc_wq_item_append(struct i915_guc_client *gc,
wqi->ring_tail = tail << WQ_RING_TAIL_SHIFT;
wqi->fence_id = rq->global_seqno;
kunmap_atomic(base);
}
static int guc_ring_doorbell(struct i915_guc_client *gc)
@ -566,7 +560,7 @@ static int guc_ring_doorbell(struct i915_guc_client *gc)
union guc_doorbell_qw *db;
int attempt = 2, ret = -EAGAIN;
desc = gc->client_base + gc->proc_desc_offset;
desc = gc->vaddr + gc->proc_desc_offset;
/* Update the tail so it is visible to GuC */
desc->tail = gc->wq_tail;
@ -582,7 +576,7 @@ static int guc_ring_doorbell(struct i915_guc_client *gc)
db_exc.cookie = 1;
/* pointer of current doorbell cacheline */
db = gc->client_base + gc->doorbell_offset;
db = gc->vaddr + gc->doorbell_offset;
while (attempt--) {
/* lets ring the doorbell */
@ -724,14 +718,14 @@ guc_client_free(struct drm_i915_private *dev_priv,
* Be sure to drop any locks
*/
if (client->client_base) {
if (client->vaddr) {
/*
* If we got as far as setting up a doorbell, make sure we
* shut it down before unmapping & deallocating the memory.
*/
guc_disable_doorbell(guc, client);
kunmap(kmap_to_page(client->client_base));
i915_gem_object_unpin_map(client->vma->obj);
}
i915_vma_unpin_and_release(&client->vma);
@ -820,6 +814,7 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
struct i915_guc_client *client;
struct intel_guc *guc = &dev_priv->guc;
struct i915_vma *vma;
void *vaddr;
uint16_t db_id;
client = kzalloc(sizeof(*client), GFP_KERNEL);
@ -846,7 +841,12 @@ guc_client_alloc(struct drm_i915_private *dev_priv,
/* We'll keep just the first (doorbell/proc) page permanently kmap'd. */
client->vma = vma;
client->client_base = kmap(i915_vma_first_page(vma));
vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
if (IS_ERR(vaddr))
goto err;
client->vaddr = vaddr;
spin_lock_init(&client->wq_lock);
client->wq_offset = GUC_DB_SIZE;

2
drivers/gpu/drm/i915/intel_guc.h
View File

@ -64,7 +64,7 @@ struct drm_i915_gem_request;
*/
struct i915_guc_client {
struct i915_vma *vma;
void *client_base; /* first page (only) of above */
void *vaddr;
struct i915_gem_context *owner;
struct intel_guc *guc;